We all know how integral to our lives social media has become, and if you've been paying attention in the golf space, you know that the big equipment companies have mastered social media about as well as anybody in any industry. But here's a first: Callaway is teaming with LinkedIn for ''Hit the Links,'' a social networking contest in which golfers and a foursome of their LinkedIn contacts can win a trip to Callaway headquarters in Carlsbad, Calif., for a round of golf and a custom clubfitting. Here's how it works: You log into the LinkedIn Connect API. It then looks through your contacts and recommends a foursome for you. The three connection types that the API looks for to fill out your foursome are: --The Company Insider: Someone within your company. The API seeks out a golfer first, but if one isn't available, then it selects the person with the most appropriate title....